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        var sg = prompt("请输入您要查询的水果")
        switch (sg) {
            case "苹果":
                alert("苹果2元/斤。")
                break;
            case "香蕉":
                alert("香蕉5元/斤。")
                break;
            case "榴莲":
                alert("榴莲10元/斤。")
                break;    
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                alert("没有找到您查询的水果。")
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